6" X 6" Sound Rated Steel Access Panel Felt Covered Door For Concealed Wall / Ceiling Application With Slotted Lock - [Outer Dimensions: 7" Width X 7" Height] Compatible with Duct 6" + Product Details Size –

+ Product Details Size – 26"w X 34"h is the size for the duct opening measurement only

Actual Filter Size – 13 3/4"w x 19 3/4" x 1"

+ Product Details Perfect Fit & Easy Sizing - Designed for a 36" x 28" OR 28" x 36" duct opening (measured at the opening)

+ Product Details Perfect Fit & Easy Sizing - Designed for a 34" x 30" Or 30" x 34" duct opening (measured at the opening)

GPH @ 1 FT: 10

6" X 6" Sound Rated Steel Access Panel Felt Covered Door For Concealed Wall / Ceiling Application With Slotted Lock - [Outer Dimensions: 7" Width X 7" Height] Compatible with Duct 6" + Product Details Size –+ Product Details Size 6" X 6" is the size for the drywall opening measurement only, actual front end outer dimensions are 7" Width X 7" Height High Quality High grade steel construction. Design 1mm galvanized steel material with sleek, shiny, durable white powder coat finish for an attractive look & high durability corrosion protection 15mm medium density fibreboard with felt cover and rubber sealing between the door and frame for tight security.